Concur Invoice - Vendor Discounts

Looking for some input on handling vendor discounts. We have vendors that we pay early to take advantage of early pay discounts. Concur Invoice does not have the ability to capture, calculate the discount and adjust the payment date.

We've set up an audit rule to call out the Vendors with discounts and have changed our Vendor's payment terms so the payment date will automatically adjust. However, we have to manually calculate the discount and reduce the total amount of the payment request.